The answer is b.) the momentum before the collision is greater than the momentum after the collision
P = m*v
7.5 = m*15
m = 7.5/15 = 0.5 kg
It holds more weight in the regular water.
Answer:
The velocity of the other fragment immediately following the explosion is v .
Explanation:
Given :
Mass of original shell , m .
Velocity of shell , + v .
Now , the particle explodes into two half parts , i.e
.
Since , no eternal force is applied in the particle .
Therefore , its momentum will be conserved .
So , Final momentum = Initial momentum

The velocity of the other fragment immediately following the explosion is v .
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